First Alert 9120B 120V AC/DC Hardwired with 9V Battery Backup I…
Rating: 841 reviews from 1 sources
Reviews
Selected Review of 29 Reviews
Perfect match to my original Very good price … Read full review
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Selected Review of 29 Reviews
Excellent product. Prompt shipping and securely packaged. Easy install. … Read full review
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Selected Review of 29 Reviews
Works well great price. … Read full review
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Selected Review of 29 Reviews
I was a older model that I needed and matched up well to my present set up. … Read full review
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Selected Review of 29 Reviews
I received them quickly and accurately. … Read full review
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Selected Review of 29 Reviews
Easy to order, Shipped Promptly, and Exact items received PERFECT FIT ! … Read full review
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Selected Review of 29 Reviews
Needed a replacement and this one was a great price. … Read full review
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Selected Review of 29 Reviews
Fit right into the existing base. Just unplugged the old and installed the new one. Would purchase again. … Read full review
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Selected Review of 29 Reviews
The smoke alarm I received wasn't actually the First Alert brand. It still works though. … Read full review
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Selected Review of 29 Reviews
Great price. Fit perfectly and seems.to work fine. … Read full review
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Selected Review of 29 Reviews
Easy installation over the base of my old smoke alarm … Read full review
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Selected Review of 29 Reviews
I found a dead 9120B from 2016 in room 150 6/13/2025 … Read full review
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Selected Review of 29 Reviews
Great product priced to sell. the bulk shipping and cost are very beneficial to homeowners with more than 2 devices. Speedy on time … Read full review
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Selected Review of 29 Reviews
Product replaces an older faulty unit nicely … Read full review
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Selected Review of 29 Reviews
Exactly what I needed to complete the circuit of my smoke alarms. Replaced seamlessly. … Read full review
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Selected Review of 29 Reviews
Fit the mount I had in my ceiling already. Good detector, works when I test it. Hopefully I never have to see it work during an actual … Read full review
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Selected Review of 29 Reviews
It's economical, easy to install, easy to change the battery and includes a CO detector. Good product at a descent price. … Read full review
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Selected Review of 29 Reviews
The product was exactly as described and fit right where the other smoke detector was positioned. … Read full review
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Selected Review of 29 Reviews
Perfect replacement for the First Alert! … Read full review
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Selected Review of 29 Reviews
Great product for the price … Read full review
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Selected Review of 29 Reviews
I ordered seven fire alarms and four came looking new, but had instant malfunctions when the battery tab was removed. They couldnât be fixed … Read full review
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Selected Review of 29 Reviews
Replaced with a unit that failed. … Read full review
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Selected Review of 29 Reviews
It was an exact replacement for the one already in my house. Made the job simpler … Read full review
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Selected Review of 29 Reviews
Affordable and easy install. … Read full review
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Selected Review of 29 Reviews
It works good,fast shipping,great great condition. … Read full review
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Selected Review of 29 Reviews
The smoke detector was an easily installed replacement unit for an existing smoke detector, with a limited service life (10 years). … Read full review
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Selected Review of 29 Reviews
WAS SO HAPPY TO GET THIS REPLACEMENT. I FEEL SAFE AGAIN!! … Read full review
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Selected Review of 29 Reviews
Exactly what I needed to replace my old ones. … Read full review
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